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32-570: The river by this name has its source in Bogstadvannet , though the source is further up, at Langlivann, and Søndre and Nordre Heggelivann in Oslomarka , the forests surrounding Oslo. Consequently, it is considered part of Oslomarkvassdragene , the river system flowing through these forests, and more specifically Sørkedalsvassdraget, the valley above Bogstadvannet. It flows out into Lysakerfjorden , part of Oslofjorden near Lysaker . There

64-500: A Red Data Book was suggested by Peter Scott in 1963. Initially the Red Data Lists were designed for specialists and were issued in a loose-leaf format that could be easily changed. The first two volumes of Red Lists were published in 1966 by conservationist Noel Simon, one for mammals and one for birds. The third volume that appeared covered reptiles and amphibians. It was created by René E. Honegger in 1968. In 1970,

96-548: A recreational area, and a footpath follows the entire length of the river on both the Oslo and Bærum sides, so that it is possible to hike around the entire river, from the Oslofjord to Bogstadvannet on one side, and back on the other. Further, the footpath connects to the network of paths throughout the forests outside Oslo, and those around the Oslofjord. The path on the Oslo side is also suitable for cycling. The terrain and scenery

128-527: A sawmill at Zinoerbrua . A mill with a finery forge and trip hammer was established here around 1780 by Conrad Clausen , the owner of Bærum Jernverk (Bærum Ironworks). The forge was situated on the Bærum side and measured 30 by 19 Norwegian ells (about 18 meters by 12 meters). It had an annual capacity of about 250 tons of wrought iron . The pig iron originated in Southern Norway , whence it

160-743: A species, group of species or specific geographic area, or in the case of BirdLife International, an entire class ( Aves ). The red list unit works with staff from the IUCN Global Species Programme as well as current program partners to recommend new partners or networks to join as new Red List Authorities. The number of species which have been assessed for the Red List has been increasing over time. As of 2023, of 150,388 species surveyed, 42,108 are considered at risk of extinction because of human activity, in particular overfishing , hunting , and land development . The idea for

192-464: Is allowed in Lysakerelven with the necessary permits only. Two species of fish dominate the river: brown trout and common minnow . salmon and sea trout will make their way from the ocean up to Fåbrofossen, whereas perch , common roach , northern pike , and common bleak will swim down from Bogstadvannet Bogstadvannet Bogstadvannet (English: Lake Bogstad ) is a lake between

224-591: Is evidence that the river has been used for mills since the 12th century, and probably earlier. The old name of the river was Få ( Norse Fǫð ), which means "fence" or "boundary". In the 18th century, Bogstadvannet was also known as Faavandet. By 1660, twelve farms had claims to the hydromechanical power generated by the river. These farms, several of which have since given names to neighborhoods in Aker (now Oslo) and Bærum, were: From Bogstadvannet going south, there are several sites of historical significance. Osdammen

256-414: Is owned and operated by Oslo Golfklubb on the south shore and a large camping ground ( Bogstad Camping ) on the east shore south of the manor. The lake is a popular destination for swimming and sunbathing in the summer. In winter, inhabitants from all Oslo go skiing and skating on the lake and the surrounding area when conditions permit. It is also a venue for Christiania Roklub , a rowing club. During

288-404: Is quite varied along the footpaths, ranging from significant hills to flat and undulating stretches. Some of the rapids are strong enough that the river is used for kayak training; other places swimming has become popular. Lysakerelven runs through a varied landscape. The basin consists mainly of spruce forest, but in the area around Bogstadvannet there is also deciduous forest. From this source,

320-680: Is used by Birdlife International , the Red List Authority for birds for the IUCN Red List. BirdLife International has recommended PE become an official tag for Critically Endangered species, and this has now been adopted, along with a "Possibly Extinct in the Wild" tag for species with populations surviving in captivity but likely to be extinct in the wild. There have been a number of versions, dating from 1991, including: All new IUCN assessments since 2001 have used version 3.1 of

352-464: The IUCN Red List or Red Data Book , founded in 1964, is an inventory of the global conservation status and extinction risk of biological species . A series of Regional Red Lists , which assess the risk of extinction to species within a political management unit, are also produced by countries and organizations. The goals of the Red List are to provide scientifically based information on

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384-702: The World Conservation Monitoring Centre , and many Specialist Groups within the IUCN Species Survival Commission (SSC). Collectively, assessments by these organizations and groups account for nearly half the species on the Red List. The IUCN aims to have the category of every species re-evaluated at least every ten years, and every five years if possible. This is done in a peer reviewed manner through IUCN Species Survival Commission Specialist Groups (SSC), which are Red List Authorities (RLA) responsible for

416-446: The occupation of Norway by Nazi Germany from 1940 to 1945, the camping ground was used for military barracks. Structures from this time remained under Norwegian military administration until the 1950s. The lake is shallow with significant flow. Algae growth is not significant, making for good bathing conditions. The environmental condition has remained stable for at least the last 20 years. The commercial development of Bogstadvannet

448-524: The western lowland gorilla ( Gorilla gorilla gorilla ) and the Cross River gorilla ( Gorilla gorilla diehli ) from endangered to critically endangered , which is the last category before extinct in the wild , due to Ebola virus and poaching , along with other factors. Russ Mittermeier , chief of Swiss -based IUCN's Primate Specialist Group, stated that 16,306 species are endangered with extinction, 188 more than in 2006 (total of 41,415 species on

480-772: The 5,487 mammals on Earth are known to be threatened with extinction, and 836 are listed as Data Deficient . The Red List of 2012 was released 19 July 2012 at Rio+20 Earth Summit ; nearly 2,000 species were added, with 4 species to the extinct list, 2 to the rediscovered list. The IUCN assessed a total of 63,837 species which revealed 19,817 are threatened with extinction. 3,947 were described as "critically endangered" and 5,766 as "endangered", while more than 10,000 species are listed as "vulnerable". At threat are 41% of amphibian species, 33% of reef-building corals, 30% of conifers, 25% of mammals, and 13% of birds. The IUCN Red List has listed 132 species of plants and animals from India as "Critically Endangered". Species are classified by

512-404: The IUCN Red List into nine groups, specified through criteria such as rate of decline, population size, area of geographic distribution, and degree of population and distribution fragmentation. There is an emphasis on the acceptability of applying any criteria in the absence of high quality data including suspicion and potential future threats, "so long as these can reasonably be supported". In

544-431: The IUCN Red List, " threatened " embraces the categories of Critically Endangered, Endangered, and Vulnerable. The older 1994 list has only a single "Lower Risk" category which contained three subcategories: In the 2001 framework, Near Threatened and Least Concern became their own categories, while Conservation Dependent was removed and its contents merged into Near Threatened . The tag of "possibly extinct" (PE)

576-593: The IUCN published its fifth volume in this series. This was the first Red Data List which focused on plants ( angiosperms only), compiled by Ronald Melville . The final volume of Red Data List created in the older, loose leaf style was volume 4 on freshwater fishes. This was published in 1979 by Robert Rush Miller . The first attempt to create a Red Data Book for a nonspecialist public came in 1969 with The Red Book: Wildlife in Danger . This book covered varies groups but

608-535: The November 2002 issue of Trends in Ecology & Evolution , an article suggested that the IUCN Red List and similar works are prone to misuse by governments and other groups that draw possibly inappropriate conclusions on the state of the environment or to affect exploitation of natural resources . In the November 2016 issue of Science Advances , a research article claims there are serious inconsistencies in

640-404: The Oslo and Bærum conurbation. The banks of the river include a wide variety of plant life. Though environmental conditions in the river have improved significantly in the last few decades, efforts are underway to improve it further. A study in 2006 recommended that the area be designed a "very important" natural resource, with most areas set aside as a natural reservation. The findings showed that

672-878: The Red List). The Red List includes the Sumatran orangutan ( Pongo abelii ) in the Critically Endangered category and the Bornean orangutan ( Pongo pygmaeus ) in the Endangered category. The 2008 Red List was released on 6 October 2008 at the IUCN World Conservation Congress in Barcelona and "confirmed an extinction crisis, with almost one in four [mammals] at risk of disappearing forever". The study shows at least 1,141 of

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704-513: The area around the river contained a rich diversity of plant and animal species, including 27 that are on the national IUCN Red List . A good variety of fish thrive in the river, and limited recreational fishing is permitted, particularly for trout. 68 different species of birds have been identified, among them the Dendrocopos minor (Lesser Spotted Woodpecker), which is redlisted in Norway; and

736-478: The area is considered an essential habitat for passerine birds in the metropolitan Oslo area. The area serves as a wildlife thoroughfare for mammals from the forests to the coastal regions, including moose and deer , who also graze there. Squirrels, red fox, badgers and other smaller rodents make their homes in the area. The redlisted species found in the area include 2 species of vascular plants , 8 mosses , 13 fungi , 2 insects, and 1 species of bird. Fishing

768-437: The categories and criteria. In 1997, the IUCN Red List received criticism on the grounds of secrecy (or at least poor documentation) surrounding the sources of its data. These allegations have led to efforts by the IUCN to improve its documentation and data quality, and to include peer reviews of taxa on the Red List. The list is also open to petitions against its classifications, on the basis of documentation or criteria. In

800-471: The city of Oslo and the municipality of Bærum , Akershus , Norway . It is part of Sørkedalsvassdraget , which in turn is part of Oslomarkvassdraget . Originally, the lake was named Få(d)vannet after an earlier name for Lysakerelven , but has since taken the name of the Bogstad estate and manor, on the east shore of the lake. In addition to the manor, Norway's first 18-hole golf course (from 1924)

832-418: The river at first meanders to about Grinidammen , and then carves an increasingly deep valley into the landscape, and at the stretch around and south of Jar, it forms a canyon with a few natural pools occurring along the way. Historically, a number of mills and also manufacturing facilities were based around the river south of Bogstad, but these have largely given way to large residential areas that are part of

864-554: The status of species and subspecies at a global level, to draw attention to the magnitude and importance of threatened biodiversity, to influence national and international policy and decision-making, and to provide information to guide actions to conserve biological diversity. Major species assessors include BirdLife International , the Institute of Zoology (the research division of the Zoological Society of London ),

896-401: The way species are classified by the IUCN. The researchers contend that the IUCN's process of categorization is "out-dated, and leaves room for improvement", and further emphasize the importance of readily available and easy-to-include geospatial data, such as satellite and aerial imaging. Their conclusion questioned not only the IUCN's method but also the validity of where certain species fall on

928-539: Was a dam with a resident mill for the sawmill at Bogstad. There is evidence that there was a sawmill at this site as early as the 16th century. Sources also suggested it delivered lumber for reconstruction in London after the Great Fire in 1666. The mill was in operation until 1915, when the owners at Bogstad agreed with the mill owner at Grini, Løvenskiold, to shut down the mill in return for enough electricity to set up

960-510: Was largely due to the works of the Bogstad estate. The Leucht family, succeeded by the Anker family, built a significant forestry enterprise in the area, and for many years the lake served as part of the waterway for floating lumber to mills along Lysakerelven . IUCN Red List The International Union for Conservation of Nature (IUCN) Red List of Threatened Species , also known as

992-541: Was predominantly about mammals and birds, with smaller sections on reptiles, amphibians, fishes, and plants. The 2006 Red List, released on 4 May 2006 evaluated 40,168 species as a whole, plus an additional 2,160 subspecies , varieties , aquatic stocks , and subpopulations . On 12 September 2007, the World Conservation Union (IUCN) released the 2007 IUCN Red List of Threatened Species . In this release, they have raised their classification of both

Lysakerelven - Misplaced Pages Continue

1024-399: Was transported by ship and unloaded at the dock at Vækerø before being pulled by horse and cart to the mill. The river is 7.4 kilometres (4.6 mi) long, with a total fall of 145 metres (476 ft). It includes several smaller rapids and waterfalls, the most prominent of these being Granfossen , often known as Fåbrofossen. In later years, the area around the river has been developed as

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